A solution to a problem of Fermat, on two numbers of which the sum is a square and the sum of their squares is a biquadrate, inspired by the Illustrious La Grange
A strict non-standard inequality .999... < 1
A succinct method for investigating the sums of infinite series through differential formulae
A theorem on circle configurations
A Translation of the T. Levi-Civita paper: Interpretazione Gruppale degli Integrali di un Sistema Canonico Rend. Acc. Lincei, s. 3^a, vol. VII, 2^o sem. 1899, pp. 235--238
A view of mathematics research productivity at U.S. regional public universities
A young person's guide to the Hopf fibration
Adam Adamandy Kochański's approximations of π: reconstruction of the algorithm
Additive properties of even perfect numbers
Aftermath
Alexandrov Par Excellence
Alexey Vasilyevich Pogorelov, the mathematician of an incredible power
Algebraic generality vs arithmetic generality in the controversy between C. Jordan and L. Kronecker (1874)
Algorithmic Information Theory and Foundations of Probability
Algorithmic information theory and martingales
Algorithmic information theory: Some recollections
An Algebra of Pieces of Space -- Hermann Grassmann to Gian Carlo Rota
An algebraic problem of finding four numbers given the products of each of the numbers with the sum of the other three
An analytical exercise
An Approximation for Square Roots known in India prior to Alexander's Conquest